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<title>Chart with DataSource Polling</title>

<style type="text/css">
/*margin and padding on body element
  can introduce errors in determining
  element position and are not recommended;
  we turn them off as a foundation for YUI
  CSS treatments. */
body {
	margin:0;
	padding:0;
}
</style>

<link rel="stylesheet" type="text/css" href="../../build/fonts/fonts-min.css" />
<script type="text/javascript" src="../../build/yahoo-dom-event/yahoo-dom-event.js"></script>
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<script type="text/javascript" src="../../build/charts/charts-min.js"></script>


<!--begin custom header content for this example-->
<style type="text/css">
	#chart
	{
		width: 500px;
		height: 350px;
	}
	
	.chart_title
	{
		display: block;
		font-size: 1.2em;
		font-weight: bold;
		margin-bottom: 0.4em;
	}
</style>
<!--end custom header content for this example-->

</head>

<body class="yui-skin-sam">


<h1>Chart with DataSource Polling</h1>

<div class="exampleIntro">
	<p>The <a href="http://developer.yahoo.com/yui/charts/">YUI Charts Control</a> provides built-in support for iterative polling for data over XHR using an XHR <a href="http://developer.yahoo.com/yui/datasource/">DataSource</a> instance.  In the example below, iterative polling causes the chart to refresh every several seconds and animate its display to represent the new data.</p>
<p>Please note: The YUI Charts Control requires Flash Player 9.0.45 or higher. The latest version of Flash Player is available at the <a href="http://www.adobe.com/go/getflashplayer">Adobe Flash Player Download Center</a>.</p>			
</div>

<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->

<span class="chart_title"></span>
<div id="chart">Unable to load Flash content. The YUI Charts Control requires Flash Player 9.0.45 or higher. You can download the latest version of Flash Player from the <a href="http://www.adobe.com/go/getflashplayer">Adobe Flash Player Download Center</a>.</p></div>

<script type="text/javascript">

	YAHOO.widget.Chart.SWFURL = "../../build/charts/assets/charts.swf";

//--- data

	var jsonData = new YAHOO.util.DataSource( "assets/generatedata.php?" );
	//use POST so that IE doesn't cache the data
	jsonData.connMethodPost = true;
	jsonData.responseType = YAHOO.util.DataSource.TYPE_JSON;
	jsonData.responseSchema =
	{
			resultsList: "Results",
			fields: ["Name","Value"]
	};
//--- chart

	var yAxis = new YAHOO.widget.NumericAxis();
	yAxis.minimum = 0;
	yAxis.maximum = 100;

	var mychart = new YAHOO.widget.ColumnChart( "chart", jsonData,
	{
		xField: "Name",
		yField: "Value",
		yAxis: yAxis,
		polling: 2000,
		//only needed for flash player express install
		expressInstall: "assets/expressinstall.swf"
	});
</script>
<!--END SOURCE CODE FOR EXAMPLE =============================== -->

</body>
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